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Changes since last update: 

- Numerous corruption fixes for copy on write
 - Numerous corruption fixes for blocksize < pagesize writes
 - Don't miscalculate AG reservations for small final AGs
 - Fix page cache truncation to work properly for reflink and extent
   shifting
 - Fix use-after-free when retrying failed inode/dquot buffer logging
 - Fix corruptions seen when using copy_file_range in directio mode
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Merge tag 'xfs-4.20-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs fixes from Darrick Wong:
 "Dave and I have continued our work fixing corruption problems that can
  be found when running long-term burn-in exercisers on xfs. Here are
  some patches fixing most of the problems, but there will likely be
  more. :/

   - Numerous corruption fixes for copy on write

   - Numerous corruption fixes for blocksize < pagesize writes

   - Don't miscalculate AG reservations for small final AGs

   - Fix page cache truncation to work properly for reflink and extent
     shifting

   - Fix use-after-free when retrying failed inode/dquot buffer logging

   - Fix corruptions seen when using copy_file_range in directio mode"

* tag 'xfs-4.20-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  iomap: readpages doesn't zero page tail beyond EOF
  vfs: vfs_dedupe_file_range() doesn't return EOPNOTSUPP
  iomap: dio data corruption and spurious errors when pipes fill
  iomap: sub-block dio needs to zeroout beyond EOF
  iomap: FUA is wrong for DIO O_DSYNC writes into unwritten extents
  xfs: delalloc -> unwritten COW fork allocation can go wrong
  xfs: flush removing page cache in xfs_reflink_remap_prep
  xfs: extent shifting doesn't fully invalidate page cache
  xfs: finobt AG reserves don't consider last AG can be a runt
  xfs: fix transient reference count error in xfs_buf_resubmit_failed_buffers
  xfs: uncached buffer tracing needs to print bno
  xfs: make xfs_file_remap_range() static
  xfs: fix shared extent data corruption due to missing cow reservation
This commit is contained in:
Linus Torvalds 2018-11-24 09:11:52 -08:00
parent 7c98a42618 8c110d43c6
commit abe72ff413
10 changed files with 104 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
fs/iomap.c
View File

@ -142,13 +142,14 @@ static void
iomap_adjust_read_range(struct inode *inode, struct iomap_page *iop,
loff_t *pos, loff_t length, unsigned *offp, unsigned *lenp)
{
loff_t orig_pos = *pos;
loff_t isize = i_size_read(inode);
unsigned block_bits = inode->i_blkbits;
unsigned block_size = (1 << block_bits);
unsigned poff = offset_in_page(*pos);
unsigned plen = min_t(loff_t, PAGE_SIZE - poff, length);
unsigned first = poff >> block_bits;
unsigned last = (poff + plen - 1) >> block_bits;
unsigned end = offset_in_page(i_size_read(inode)) >> block_bits;
/*
* If the block size is smaller than the page size we need to check the
@ -183,8 +184,12 @@ iomap_adjust_read_range(struct inode *inode, struct iomap_page *iop,
* handle both halves separately so that we properly zero data in the
* page cache for blocks that are entirely outside of i_size.
*/
if (first <= end && last > end)
plen -= (last - end) * block_size;
if (orig_pos <= isize && orig_pos + length > isize) {
unsigned end = offset_in_page(isize - 1) >> block_bits;
if (first <= end && last > end)
plen -= (last - end) * block_size;
}
*offp = poff;
*lenp = plen;
@ -1580,7 +1585,7 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
struct bio *bio;
bool need_zeroout = false;
bool use_fua = false;
int nr_pages, ret;
int nr_pages, ret = 0;
size_t copied = 0;
if ((pos | length | align) & ((1 << blkbits) - 1))
@ -1596,12 +1601,13 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
if (iomap->flags & IOMAP_F_NEW) {
need_zeroout = true;
} else {
} else if (iomap->type == IOMAP_MAPPED) {
/*
* Use a FUA write if we need datasync semantics, this
* is a pure data IO that doesn't require any metadata
* updates and the underlying device supports FUA. This
* allows us to avoid cache flushes on IO completion.
* Use a FUA write if we need datasync semantics, this is a pure
* data IO that doesn't require any metadata updates (including
* after IO completion such as unwritten extent conversion) and
* the underlying device supports FUA. This allows us to avoid
* cache flushes on IO completion.
*/
if (!(iomap->flags & (IOMAP_F_SHARED|IOMAP_F_DIRTY)) &&
(dio->flags & IOMAP_DIO_WRITE_FUA) &&
@ -1644,8 +1650,14 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
ret = bio_iov_iter_get_pages(bio, &iter);
if (unlikely(ret)) {
/*
* We have to stop part way through an IO. We must fall
* through to the sub-block tail zeroing here, otherwise
* this short IO may expose stale data in the tail of
* the block we haven't written data to.
*/
bio_put(bio);
return copied ? copied : ret;
goto zero_tail;
}
n = bio->bi_iter.bi_size;
@ -1676,13 +1688,21 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
dio->submit.cookie = submit_bio(bio);
} while (nr_pages);
if (need_zeroout) {
/*
* We need to zeroout the tail of a sub-block write if the extent type
* requires zeroing or the write extends beyond EOF. If we don't zero
* the block tail in the latter case, we can expose stale data via mmap
* reads of the EOF block.
*/
zero_tail:
if (need_zeroout ||
((dio->flags & IOMAP_DIO_WRITE) && pos >= i_size_read(inode))) {
/* zero out from the end of the write to the end of the block */
pad = pos & (fs_block_size - 1);
if (pad)
iomap_dio_zero(dio, iomap, pos, fs_block_size - pad);
}
return copied;
return copied ? copied : ret;
}
static loff_t
@ -1857,6 +1877,15 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
dio->wait_for_completion = true;
ret = 0;
}
/*
* Splicing to pipes can fail on a full pipe. We have to
* swallow this to make it look like a short IO
* otherwise the higher splice layers will completely
* mishandle the error and stop moving data.
*/
if (ret == -EFAULT)
ret = 0;
break;
}
pos += ret;

15
fs/read_write.c
View File

@ -2094,17 +2094,18 @@ int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same)
off = same->src_offset;
len = same->src_length;
ret = -EISDIR;
if (S_ISDIR(src->i_mode))
goto out;
return -EISDIR;
ret = -EINVAL;
if (!S_ISREG(src->i_mode))
goto out;
return -EINVAL;
if (!file->f_op->remap_file_range)
return -EOPNOTSUPP;
ret = remap_verify_area(file, off, len, false);
if (ret < 0)
goto out;
return ret;
ret = 0;
if (off + len > i_size_read(src))
@ -2147,10 +2148,8 @@ next_fdput:
fdput(dst_fd);
next_loop:
if (fatal_signal_pending(current))
goto out;
break;
}
out:
return ret;
}
EXPORT_SYMBOL(vfs_dedupe_file_range);

5
fs/xfs/libxfs/xfs_bmap.c
View File

@ -1694,10 +1694,13 @@ xfs_bmap_add_extent_delay_real(
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The right neighbor is contiguous, the left is not.
* The right neighbor is contiguous, the left is not. Take care
* with delay -> unwritten extent allocation here because the
* delalloc record we are overwriting is always written.
*/
PREV.br_startblock = new->br_startblock;
PREV.br_blockcount += RIGHT.br_blockcount;
PREV.br_state = new->br_state;
xfs_iext_next(ifp, &bma->icur);
xfs_iext_remove(bma->ip, &bma->icur, state);

11
fs/xfs/libxfs/xfs_ialloc_btree.c
View File

@ -538,15 +538,18 @@ xfs_inobt_rec_check_count(
static xfs_extlen_t
xfs_inobt_max_size(
struct xfs_mount *mp)
struct xfs_mount *mp,
xfs_agnumber_t agno)
{
xfs_agblock_t agblocks = xfs_ag_block_count(mp, agno);
/* Bail out if we're uninitialized, which can happen in mkfs. */
if (mp->m_inobt_mxr[0] == 0)
return 0;
return xfs_btree_calc_size(mp->m_inobt_mnr,
(uint64_t)mp->m_sb.sb_agblocks * mp->m_sb.sb_inopblock /
XFS_INODES_PER_CHUNK);
(uint64_t)agblocks * mp->m_sb.sb_inopblock /
XFS_INODES_PER_CHUNK);
}
static int
@ -594,7 +597,7 @@ xfs_finobt_calc_reserves(
if (error)
return error;
*ask += xfs_inobt_max_size(mp);
*ask += xfs_inobt_max_size(mp, agno);
*used += tree_len;
return 0;
}

10
fs/xfs/xfs_bmap_util.c
View File

@ -1042,7 +1042,7 @@ out_trans_cancel:
goto out_unlock;
}
static int
int
xfs_flush_unmap_range(
struct xfs_inode *ip,
xfs_off_t offset,
@ -1195,13 +1195,7 @@ xfs_prepare_shift(
* Writeback and invalidate cache for the remainder of the file as we're
* about to shift down every extent from offset to EOF.
*/
error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, offset, -1);
if (error)
return error;
error = invalidate_inode_pages2_range(VFS_I(ip)->i_mapping,
offset >> PAGE_SHIFT, -1);
if (error)
return error;
error = xfs_flush_unmap_range(ip, offset, XFS_ISIZE(ip));
/*
* Clean out anything hanging around in the cow fork now that

3
fs/xfs/xfs_bmap_util.h
View File

@ -80,4 +80,7 @@ int xfs_bmap_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
int whichfork, xfs_extnum_t *nextents,
xfs_filblks_t *count);
int xfs_flush_unmap_range(struct xfs_inode *ip, xfs_off_t offset,
xfs_off_t len);
#endif /* __XFS_BMAP_UTIL_H__ */

28
fs/xfs/xfs_buf_item.c
View File

@ -1233,9 +1233,23 @@ xfs_buf_iodone(
}
/*
* Requeue a failed buffer for writeback
* Requeue a failed buffer for writeback.
*
* Return true if the buffer has been re-queued properly, false otherwise
* We clear the log item failed state here as well, but we have to be careful
* about reference counts because the only active reference counts on the buffer
* may be the failed log items. Hence if we clear the log item failed state
* before queuing the buffer for IO we can release all active references to
* the buffer and free it, leading to use after free problems in
* xfs_buf_delwri_queue. It makes no difference to the buffer or log items which
* order we process them in - the buffer is locked, and we own the buffer list
* so nothing on them is going to change while we are performing this action.
*
* Hence we can safely queue the buffer for IO before we clear the failed log
* item state, therefore always having an active reference to the buffer and
* avoiding the transient zero-reference state that leads to use-after-free.
*
* Return true if the buffer was added to the buffer list, false if it was
* already on the buffer list.
*/
bool
xfs_buf_resubmit_failed_buffers(
@ -1243,16 +1257,16 @@ xfs_buf_resubmit_failed_buffers(
struct list_head *buffer_list)
{
struct xfs_log_item *lip;
bool ret;
ret = xfs_buf_delwri_queue(bp, buffer_list);
/*
* Clear XFS_LI_FAILED flag from all items before resubmit
*
* XFS_LI_FAILED set/clear is protected by ail_lock, caller this
* XFS_LI_FAILED set/clear is protected by ail_lock, caller of this
* function already have it acquired
*/
list_for_each_entry(lip, &bp->b_li_list, li_bio_list)
xfs_clear_li_failed(lip);
/* Add this buffer back to the delayed write list */
return xfs_buf_delwri_queue(bp, buffer_list);
return ret;
}

2
fs/xfs/xfs_file.c
View File

@ -920,7 +920,7 @@ out_unlock:
}
loff_t
STATIC loff_t
xfs_file_remap_range(
struct file *file_in,
loff_t pos_in,

18
fs/xfs/xfs_reflink.c
View File

@ -296,6 +296,7 @@ xfs_reflink_reserve_cow(
if (error)
return error;
xfs_trim_extent(imap, got.br_startoff, got.br_blockcount);
trace_xfs_reflink_cow_alloc(ip, &got);
return 0;
}
@ -1351,10 +1352,19 @@ xfs_reflink_remap_prep(
if (ret)
goto out_unlock;
/* Zap any page cache for the destination file's range. */
truncate_inode_pages_range(&inode_out->i_data,
round_down(pos_out, PAGE_SIZE),
round_up(pos_out + *len, PAGE_SIZE) - 1);
/*
* If pos_out > EOF, we may have dirtied blocks between EOF and
* pos_out. In that case, we need to extend the flush and unmap to cover
* from EOF to the end of the copy length.
*/
if (pos_out > XFS_ISIZE(dest)) {
loff_t flen = *len + (pos_out - XFS_ISIZE(dest));
ret = xfs_flush_unmap_range(dest, XFS_ISIZE(dest), flen);
} else {
ret = xfs_flush_unmap_range(dest, pos_out, *len);
}
if (ret)
goto out_unlock;
return 1;
out_unlock:

5
fs/xfs/xfs_trace.h
View File

@ -280,7 +280,10 @@ DECLARE_EVENT_CLASS(xfs_buf_class,
),
TP_fast_assign(
__entry->dev = bp->b_target->bt_dev;
__entry->bno = bp->b_bn;
if (bp->b_bn == XFS_BUF_DADDR_NULL)
__entry->bno = bp->b_maps[0].bm_bn;
else
__entry->bno = bp->b_bn;
__entry->nblks = bp->b_length;
__entry->hold = atomic_read(&bp->b_hold);
__entry->pincount = atomic_read(&bp->b_pin_count);